e1000: resolve tx multiqueue bug

With the recent changes to tx mutiqueue, e1000 was not calling
netif_start_queue() before calling netif_wake_queue().
This causes an oops during loading of the driver.

(Based on commit d55b53ff
("igb/ixgbe/e1000e: resolve tx multiqueue bug").)
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/e1000/e1000_main.c

@@ -1472,6 +1472,8 @@ e1000_open(struct net_device *netdev)
 
 	e1000_irq_enable(adapter);
 
+	netif_start_queue(netdev);
+
 	/* fire a link status change interrupt to start the watchdog */
 	E1000_WRITE_REG(&adapter->hw, ICS, E1000_ICS_LSC);